Battery, battery can, battery pack, electronic device, electric vehicle, electricity storage device, and electric power system

1. A battery comprising: an electrode body; and a battery can housing the electrode body and having a bottom portion, wherein the bottom portion has an arc-shaped groove, an opening angle of the groove with respect to a center of the arc is 0.5 degrees or more and 56 degrees or less, and a ratio of an inner diameter of the groove with respect to an outer diameter of the bottom portion is 44% or more and 77% or less.

2. The battery according to claim 1 , wherein the groove is disposed inside the battery can.

3. The battery according to claim 1 , wherein a volume energy density of the battery is 430 Wh/L or more.

4. The battery according to claim 1 , wherein the bottom portion at a bottom of the groove has a thickness of 0.020 mm or more and 0.150 mm or less.

5. The battery according to claim 1 , wherein the groove has a width of 0.10 mm or more and 1.00 mm or less.

6. The battery according to claim 1 , further comprising a safety valve for releasing gas when the gas is generated in the battery can.

7. The battery according to claim 6 , wherein a gas release pressure of the groove is higher than a gas release pressure of the safety valve.

8. The battery according to claim 1 , wherein a center of the arc coincides with a center of the bottom portion.

9. The battery according to claim 1 , wherein a cross-sectional shape of the groove is a substantially trapezoidal shape, a substantially rectangular shape, a substantially triangular shape, a substantially partially circular shape, a substantially partially elliptical shape, or an indefinite shape.

10. The battery according to claim 1 , wherein the electrode body includes a positive electrode and a negative electrode, and an open circuit voltage in a fully charged state per pair of the positive electrode and the negative electrode is 4.4 V or more and 6.00 V or less.

12. A battery pack comprising: the battery according to claim 1 ; and a control unit for controlling the battery.

13. An electronic device comprising the battery according to claim 1 , wherein the electronic device receives electric power from the battery.

14. An electric vehicle comprising: the battery according to claim 1 ; a converter for converting electric power supplied from the battery into a driving force of the vehicle; and a control device for performing information processing regarding vehicle control on the basis of information regarding the battery.

15. An electricity storage device comprising the battery according to claim 1 , wherein the electricity storage device supplies electric power to an electronic device connected to the battery.

16. The electricity storage device according to claim 15 , further comprising an electric power information control device for transmitting a signal to or receiving a signal from another device via a network, wherein the electricity storage device performs charge-discharge control of the battery on the basis of information received by the electric power information control device.

17. An electric power system comprising the battery according to claim 1 , wherein the electric power system receives electric power from the battery.

18. The electric power system according to claim 17 , wherein electric power is supplied to the battery from a power generating device or an electric power network.

19. A battery can comprising a bottom portion with an arc-shaped groove, wherein an opening angle of the groove with respect to a center of the arc is 0.5 degrees or more and 56 degrees or less, and a ratio of an inner diameter of the groove with respect to an outer diameter of the bottom portion is 44% or more and 77% or less.